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    δ13C of organic matter transported from the leaves to the roots in Eucalyptus delegatensis: short-term variations and relation to respired CO2

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    Authors
    Gessler, A.
    Keitel, C.
    Kodama, N.
    Weston, C.
    Winters, A.
    Keith, H.
    Grice, Kliti
    Leuning, R.
    Farquhar, G.
    Date
    2007
    Type
    Journal Article
    
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    Citation
    Gessler, Arthur and Keitel, Claudia and Kodama, Naomi and Weston, Christopher and Winters, Anthony and Keith, Heather and Grice, Kliti and Leuning, Ray and Farquhar, Graham. 2007. δ13C of organic matter transported from the leaves to the roots in Eucalyptus delegatensis: short-term variations and relation to respired CO2. Functional Plant Biology 34 (8): pp. 692-706.
    Source Title
    Functional Plant Biology
    DOI
    10.1071/FP07064
    ISSN
    14454408
    Faculty
    Department of Applied Chemistry
    School of Science and Computing
    Faculty of Science and Engineering
    URI
    http://hdl.handle.net/20.500.11937/45098
    Collection
    • Curtin Research Publications
    Abstract

    Post-photosynthetic carbon isotope fractionation might alter the isotopic signal imprinted on organic matter (OM) during primary carbon fixation by Rubisco. To characterise the influence of post-photosynthetic processes, we investigated the effect of starch storage and remobilisation on the stable carbon isotope signature (delta C-13) of different carbon pools in the Eucalyptus delegatensis R. T. Baker leaf and the potential carbon isotope fractionation associated with phloem transport and respiration. Twig phloem exudate and leaf water-soluble OM showed diel variations in delta C-13 of up to 2.5 and 2 parts per thousand, respectively, with C-13 enrichment during the night and depletion during the day. Damped diel variation was also evident in bulk lipids of the leaf and in the leaf wax fraction. delta C-13 of nocturnal phloem exudate OM corresponded with the delta C-13 of carbon released from starch. There was no change in delta C-13 of phloem carbon along the trunk. CO2 emitted from trunks and roots was C-13 enriched compared with the potential organic substrate, and depleted compared with soil-emitted CO2. The results are consistent with transitory starch accumulation and remobilisation governing the diel rhythm of delta C-13 in phloem-transported OM and fragmentation fractionation occurring during respiration. When using delta C-13 of OMor CO2 for assessing ecosystem processes or plant reactions towards environmental constraints, post- photosynthetic discrimination should be considered.

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